The system has been fixed, but discolored water has to be flushed out of the city's pipes.
Under the advisory, all Jersey City residents and businesses will have to boil their water for at least one minute for the following: drinking, cooking or baking, making ice cubes, taking medication, brushing teeth, washing food, mixing baby formula or food, mixing juices or drinks, feeding pets and all other consumption.
But water does not have to be boiled to shower, wash dishes or clothes.
United Water officials say safety tests on the water could take up to 48 hours.
